Harvest Walnut is a European made Laminate Flooring that offers the ultimate in style, design and performance. This flooring is 12mm thick and Greenguard Gold certified (Best made for indoor uses) for healthier homes. The product features an AC4 melamine wear layer impregnated with Aluminum Oxide for added durability and offers a triple warranty against fading, staining, and wear. For installation below grade, over crawl spaces or on concrete, a moisture/vapour barrier is required. This may be provided as a feature of the underlayment or, in the case of an underlayment without moisture/vapour barrier, a 6-mil poly moisture/vapour barrier must be installed and sealed before the underlayment. Please always refer to the installation instructions specific to your product.